(fwd) On DV Dra identification Date: Sun, 7 May 2000 20:51:36 +0300 (EET DST) From: stars@personal.eunet.fi (Timo Kinnunen) Subject: DV Dra id problem Hello, In the following message Kato-San wrote: >[vsnet-obs 1605] DV Dra outburst, continuing? > >DV Dra > > A 6-min V-band CCD exposure of DV Dra taken at Ouda Station last night >clearly shows DV Dra (WZ Sge-type candidate) siginificantly brighter than >in Downes & Shara (1993) chart. Astrometry using 6 GSC stars (mean residual >0".3) gives 18h17m24s.44 +50o48'16".6 (J2000.0). This position is slightly >different from that given in Downes & Shara (1993), but is in good agreement >with one (18h17m24s.44 +50o48'16".3) obtained by M. Iida from his outburst >CCD image (Iida, private communication). Reanalysis of the Nov. 13 CCD >image (already reported in vsnet-obs #1595, but the measurement was done >for the coordinates by Downes & Shara (1993)) confirms this finding. The position given above, and also the SIMBAD position: 18 17 25.070 +50 48 14.50 (2000) fall only a few arcseconds from an A2.0 star 1350.09592107 - at 18 17 24.71 +50 48 19.19 (2000) DV Dra can be very easily confused with this star - it is certainly noteworthy, however I could not find any remarks on it from 1995 outburst reports. Pardon me, I don't have the relevant IBVS issue at hand, but I find it interesting that the outburst photometry apparently was not disturbed by this A2.0 star. > Reexamination of POSS and the candidate by Downes & >Shara (1993) in digitized GSC survey plate would help identifying the nature >of this intriguing outburst. I checked the available POSS scans at USNO Flagstaff - the following plate shows a DV Dra candidate some 10" due N from this A2.0 star. Details: > POSSII 0229 SJ06278 1995.4976 see 5' square image at http://vsnet.nofs.navy.mil/tmp/fchaanCqa_sj0229.000.jpg I believe the date is close to 1995 June 30 - about four months prior to the outburst report by Iida, so it would be very intriguing to find out whether the POSS-II candidate is true DV Dra, another variable, or a plate flaw. Regards, Timo Kinnunen